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  slave managers email ，in this feild could input this slave node manager's email, for example :
  joy@gmail.com;tom@gmail.com;lucy@gmail.com;  and so-on ,the managers' email address was devided
  with ";" ,when this slave offline , hudson could send email to those managers , the email include 
  some way of connectting slave node to master  subject and the information of this node 
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